Maybe they want a smaller group? Maybe they don't want to deal with children on the holiday? Maybe they see it as giving you a break? Maybe they just want time with you undistracted?
I don't think they've done anything wrong. You could ask if you could invite your daughter along but be prepared for a no.
Fruit flies - help needed please.
Army horses loose on London streets
Have any of you got all electric cars? Pros and cons please.